Ignition: Interlock Device Intoxalock Wiring Diagram

Here is a simplified schematic of the starter kill path:

| Wire Color | Standard Function | Connection Point in Vehicle | | :--- | :--- | :--- | | | Main Power (12V Constant) | Direct to Positive battery terminal or Constant power at ignition harness. | | Black | Chassis Ground | Bare metal frame ground (sand any paint off). | | Yellow | Ignition Switched Power (12V IGN) | Wire that receives 12V only when key is in "RUN" or "ACC" position. | | White | Starter Kill (Normally Closed) | Cut the vehicle's starter wire. Connect White to the Key Side of the cut. | | Green | Starter Kill (Normally Open) | Cut the vehicle's starter wire. Connect Green to the Starter Motor Side of the cut. | | Blue | Tach / Data Link (Optional) | Connects to negative side of ignition coil (gas) or Glow plug light (diesel). | Ignition Interlock Device Intoxalock Wiring Diagram

Secured to a clean, unpainted metal surface on the vehicle chassis. 🛠️ Components of the Installation Here is a simplified schematic of the starter

When the driver successfully passes the breath test, the internal logic completes an integrated circuit. This sends a high-current signal forward to engage the starter solenoid. Color-Coded Harness Breakdown | | White | Starter Kill (Normally Closed)

While specific wire colors vary by vehicle make and model, the standard logic remains consistent: 1. The Starter Interrupt This is the most critical connection.

An Intoxalock system consists of two primary hardware sections: the in-cab handheld breathalyzer unit and the under-dash engine control module (relay box). The system works fundamentally by acting as an electronic gatekeeper placed in series with the vehicle's starter circuit.